Longtime reader, first time writer. I love reading your stuff, well worthwhile.
My query is about fuel additives, after-market specifically. I have used the Lucas Oil products and found them to produce a mile or two better MPG in my 94 D21 four banger. (Note: that’s a Nissan Hardbody – SM)
What is your take on additives? Have you found any others to be of significant value to the user/user’s vehicle?